ISL83387E

±15kV ESD Protected, +3V to +5.5V, 1µA, 250kbps, RS-232 Transceivers and a Separate Logic Supply

Product Status: Mass Production

OVERVIEW

The ISL83387E is a 3.0V to 5.5V powered RS‑232 transceiver that meets ElA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. Additionally, it provides ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS‑232 pins). Targeted applications are industrial laptop computers, Palmtops, PDAs, and notebooks where the low operational power consumption and even lower standby power consumption is critical. Efficient on‑chip charge pumps coupled with manual and enhanced automatic powerdown functions reduce the standby supply current to a 1µA trickle. The TSSOP packaging and the use of small, low value capacitors ensure board space savings. Data rates greater than 250kbps are ensured at worst case load conditions.

The ISL83387E features a VL pin that adjusts the logic pin output levels and input thresholds to values compatible with the VCC powering the external logic (for example, a UART).

The ISL83387E includes an enhanced automatic power‑down function that powers down the on-chip power‑supply and driver circuits. Automatic powerdown occurs when all receiver and transmitter inputs detect no signal transitions for a period of 30 seconds. The ISL83387E powers back up automatically, when it senses a transition on any transmitter or receiver input.

Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.

KEY FEATURES

    • VL supply pin for compatibility with mixed voltage systems
    • ESD protection for RS-232 I/O pins to ±15kV (IEC61000)
    • Low power, pin compatible upgrade for MAX3387E
    • Manual and enhanced automatic powerdown features
    • Meets EIA/TIA-232 and V.28/V.24 specifications at 3V
    • On-chip charge pumps require only four external 0.1µF capacitors
    • Receivers stay active in powerdown
    • Very low supply current: 300µA
    • Assured minimum data rate: 250kbps
    • Wide power supply range: Single +3V to +5.5V
    • Low supply current in powerdown state: < 1µA
    • Pb-Free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL83387E
Basic Information
Production Status
Mass Production
# of Rx
3
# of Tx
3
High ESD Protection
Yes
Data Rate
0.5 Mbps
Supply Voltage Vcc (Min) (V)
3
Supply Voltage Vcc (Max) (V)
5.5
Manual Shutdown
Yes
Auto Shutdown
Enhanced
Rx Disable
No
Capacitance Value
0.1 µF
IS Enabled (mA)
0.3
IS Disabled
1 µA
Qualification Level
Standard
Supply Voltage Vcc Range (V)
3 to 5.5
Can Sample
YES
Temperature Range
-40 to +85

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